CN216861569U - A child stroller frame - Google Patents

Abstract

The utility model discloses a stroller frame which comprises a foldable bottom support frame, wherein the bottom support frame comprises a front leg and a rear leg which is rotatably connected to the front leg around a first axis A, wheel assemblies are connected to the front leg and the rear leg, a hand push rod which can slide relative to the front leg and can be unfolded or folded is further connected to the front leg, a first locking device which can lock the hand push rod in an unfolded state is arranged between the hand push rod and the bottom support frame, and a second locking device which can lock the front leg and the rear leg and can be unlocked by the hand push rod in a linkage mode when the hand push rod slides relative to the bottom support frame is further arranged between the front leg and the rear leg. The utility model aims to overcome the defects of the prior art and provide a stroller frame which is convenient to fold and unfold.

Description

A child stroller frame

【Technical field】

The utility model relates to a frame of a children's stroller.

【Background technique】

The stroller frame has become a common product in the growth process of children. For the convenience of carrying or storage, the current stroller frame is generally foldable through various link structures. The utility model provides another foldable structure to realize the folding of the frame of the children's stroller.

The present utility model is formally developed based on the above-mentioned deficiencies.

【Content of utility model】

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a child stroller frame that can be folded and unfolded conveniently.

The utility model is achieved through the following technical solutions:

A child stroller frame, comprising a foldable bottom support frame 1, the bottom support frame 1 includes a front leg 11 and a rear leg 12 rotatably connected to the front leg 11 around a first axis A, the front The legs 11 and the rear legs 12 are both connected with wheel assemblies 13, and the front legs 11 are also connected with hand push rods 14 that can slide relative to them to expand or fold, and the hand push rods 14 are supported by the bottom. There is a first locking device 2 between the racks 1 that can lock the push rod 14 in the unfolded state, and between the front legs 11 and the rear legs 12 is also provided with the ability to lock the two and the push rod 14 is opposite to each other. The second locking device 3 can be linked and unlocked by the push rod 14 when the bottom support frame 1 slides.

The front leg 11 is also rotatably connected with a connecting seat 5 that can be connected to the seat assembly 4 and can be rotated and folded to the front leg 11 around the second axis B. There is a third locking device 6 capable of locking the connection base 5 in the deployed position.

The front leg 11 is also provided with a secondary locking device 7 that can prevent the connecting base 5 from rotating relative to the bottom support frame 1 and can be linked and unlocked by the hand push rod 14 when the hand push rod 14 slides relative to the front leg 11 .

The first locking device 2 includes a locking position 21 provided on the front leg 11 , and the hand push rod 14 is provided with a latching member 22 that can slide relative to the hand push rod 14 to be engaged or disengaged from the locking position 21 . , between the locking member 22 and the hand push rod 14 is provided with a sliding member 23 that can drive the locking member 22 to disengage from the locking position 21 when pulled, and the hand push rod 14 is also provided with a sliding member 23 on the hand push rod 14. An operating member 24 that can make the sliding member 23 slide relative to the hand push rod 14 during operation, and a transmission member 25 that can drive the sliding member 23 to slide is provided between the operating member 24 and the sliding member 23 when the operating member 24 is operated. A first elastic member 26 is provided between the locking member 22 and the hand push rod 14 to keep the locking member 22 in a locked state, and a first elastic member 26 is provided between the sliding member 23 and the hand push rod 14 . Return spring 27.

The lower end of the front leg 11 is also provided with a positioning portion 111 for the locking member 22 to be locked and positioned, and when the locking member 22 is locked into the positioning portion 111, the second locking device 3 is still locked.

The hand push rod 14 is also provided with a secondary locking assembly 8 that can prevent the first locking device 2 from being unlocked. The unlocking member 81 that prevents the operating member 24 from sliding relative to the push rod 14, the unlocking member 81 is connected with an operating portion 811 that can operate the unlocking member 81 to rotate so that the unlocking member 81 gives way to the operating member 24, and the unlocking member 81 is There is also a second elastic member 82 between the member 81 and the push rod 14 , which can keep the unlocking member 81 in a position preventing the sliding of the operating member 24 .

The second locking device 3 includes a first hinged shell 31 provided on the front leg 11 and a second hinged shell 32 provided on the rear leg 12. The first hinged shell 31 and the second hinged shell 32 A cavity 33 is formed between them, the first hinge shell 31 and the second hinge shell 32 are both connected with spline grooves 34, the cavity 33 is slidably connected with a spline 35, and the first hinge joint The casing 31 is rotatably connected with a pressing member 36 that can push the splines 35 to slide laterally and disengage from the spline grooves 34 on the first hinge shell 31. The pressing member 36 is located on the eccentric position of the pressing member 36. Connected with a drive rod 37 that is pushed by the hand push rod 14 to drive the pressing member 36 to rotate when the hand push rod 14 slides relative to the front leg 11 . The driving position 38 that pushes the driving rod 37 downward, is provided with a second return spring 39 between the driving rod 37 and the pressing member 36 , and is provided between the spline 35 and the second hinge shell 32 The third elastic member 30 capable of simultaneously engaging the splines 35 with the spline grooves 34 on the first hinge shell 31 and the second hinge shell 32 .

The third locking device 6 includes a sliding member 61 slidably connected to the connection base 5 , and the bottom support frame 1 is provided with a sliding member 61 that can abut against the sliding member 61 to prevent the connection base 5 from rotating relative to the bottom support frame 1 . The stop position 62, the connecting seat 5 is provided with an operation button 63 that can make the sliding member 61 slide relative to the connecting seat 5 and disengage the stop position 62 during operation. A pull cable 64 is provided, and a fourth elastic element 65 is provided between the sliding member 61 and the connecting seat 5 to keep the sliding member 61 and the stop position 62 in abutting state.

The second locking device 7 includes a rotating rod 71 that is rotatably connected to the bottom support frame 1 . The top pressing portion 711 of the rotating rod 71 is caused by the top pressing of the rod 14, and the position where the rotating rod 71 stays includes a blocking position that can prevent the rotation of the connecting base 5 and a position that can make way for the rotating movement of the connecting base 5. In the unlocking position, when the rotating rod 71 is driven by the hand push rod 14 to rotate relative to the bottom support frame 1, the rotating rod 71 moves to the unlocking position to make way for the rotating movement of the connecting seat 5. When the rotating rod 71 and the hand When the push rod 14 is disengaged, the self-weight of the rotating rod 71 causes the rotating rod 71 to move from the unlocking position to the blocking position.

The front leg 11 is also rotatably connected with a leg rest member 112 that can be unfolded or folded.

Compared with the prior art, the utility model has the following advantages:

1. When the frame of the stroller of the present invention needs to be folded, first unlock the first locking device. After the first locking device is unlocked, push the hand push rod to slide downward relative to the front leg. At this time, the hand push rod will lock the second locking device. When the linkage is unlocked, the front leg and the rear leg are also unlocked. When the adult lifts the push rod and the front leg, the rear leg rotates around the first axis A and moves closer to the front leg under its own weight. The child stroller frame of the utility model can complete the folding of the whole child stroller frame only by pushing and lifting the second locking device after unlocking, and the unlocking and folding operation is more convenient.

2. When the latch is snapped into the positioning part, the hand push rod is locked in the folded position, and the hand push rod will not slide relative to the front leg, but the second locking device is still in the locked state, the rear leg and the front leg are still locked. When the legs are still open, and the seat assembly is facing the direction of the push rod, the stroller can also be used as a children's dining chair, which is applicable to a wider range.

【Description of drawings】

Fig. 1 is one of the perspective views of the frame of the children's stroller of the present utility model;

Fig. 2 is the second perspective view of the frame of the children's stroller of the present utility model;

Fig. 3 is the side view of the frame of the children's stroller of the present invention;

Fig. 4 is the state diagram when the frame of the children's stroller of the present invention is folded;

Fig. 5 is the state diagram when the frame of the children's stroller of the present invention is folded and completed;

Figure 6 is a cross-sectional view of the child's stroller frame of the present invention;

The enlarged view of C area in Fig. 7 Fig. 6;

The enlarged view of D area in Fig. 8 Fig. 6;

The enlarged view of E region in Fig. 9 Fig. 6;

Figure 10 is one of the exploded views of the second locking device in the stroller frame of the present invention;

11 is the second exploded view of the second locking device in the frame of the stroller of the present invention;

12 is a perspective view of the top pressing member and the driving rod in the frame of the stroller of the present invention;

13 is an exploded view of the third locking device in the frame of the stroller of the present invention;

14 is a cross-sectional view of the child stroller frame of the present invention during the folding process;

Figure 15 is an enlarged view of the F region in Figure 14;

Figure 16 is an enlarged view of the G region in Figure 14;

17 is a perspective view of the first protrusion and the second protrusion in the stroller frame of the present invention;

18 is a perspective view of another use state of the stroller frame of the present utility model;

Figure 19 is a state diagram of the child stroller frame of the present invention when the folding is completed.

【Detailed ways】

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Figures 1 to 19, the present invention provides a frame of a child's stroller, which includes a bottom support frame 1 that can be folded. The bottom support frame 1 includes a front leg 11 and is rotatably connected to the front The rear leg 12 on the leg 11, the front leg 11 and the rear leg 12 are connected with a wheel assembly 13, and the front leg 11 is also connected with a hand push rod 14 that can slide relative to it to unfold or fold , and between the hand push rod 14 and the bottom support frame 1 is provided with a first locking device 2 capable of locking the hand push rod 14 in the unfolded state, and between the front leg 11 and the rear leg 12 is also provided with The second locking device 3 can lock the two and can be linked and unlocked by the hand push rod 14 when the hand push rod 14 slides relative to the bottom support frame 1 .

When the frame of the stroller of the present invention needs to be folded, first unlock the first locking device 2, after the first locking device 2 is unlocked, push the hand push rod 14 to slide down relative to the front leg 11, at this time, the hand push rod 14 will When the two locking devices 3 are linked and unlocked, the front leg 11 and the rear leg 12 are also unlocked. When the adult lifts the hand push rod 14 and the front leg 11, the rear leg 12 rotates around the first axis A and moves closer to the front leg 11 under its own weight. . The child stroller frame of the utility model can fold the entire child stroller frame only by pushing and lifting the second locking device 3 after unlocking, and the unlocking and folding operation is more convenient.

As shown in FIGS. 6 to 7 , the front leg 11 is also rotatably connected with a connecting seat 5 that can be connected to the seat assembly 4 and can be rotated and folded to the front leg 11 around the second axis B. The connecting seat 5 is connected to the A third locking device 6 capable of locking the connecting base 5 in the deployed position is further provided between the bottom support frames 1 . After unlocking the third locking device 6 , the adult pushes the connecting base 5 to rotate and fold the front leg 11 , which can reduce the space occupied by the folding.

As shown in FIGS. 6 to 7 , the front leg 11 is also provided with a mechanism that can prevent the connecting seat 5 from rotating relative to the bottom support frame 1 and can be linked and unlocked by the hand push rod 14 when the hand push rod 14 slides relative to the front leg 11 . Secondary locking device 7. The secondary locking device 7 can prevent the third locking device 6 from being unlocked by mistake, so that the seat assembly 4 mounted on the connecting base 5 is folded close to the front legs 11 , so that the child can ride more safely. When the stroller needs to be folded, unlock the secondary locking device 7, then push down the hand push rod 14 to slide to unlock the secondary locking device 7, unlock the secondary locking device 7 and then unlock the third locking device 6, at this time the seat The assembly 4 can then be folded toward the front legs 11 under the driving of the connecting base 5 .

As shown in FIGS. 7 to 8 , the first locking device 2 includes a locking position 21 provided on the front leg 11 , and the hand push rod 14 is provided with a sliding relative to the hand push rod 14 to be engaged or disengaged The locking member 22 of the locking position 21 is provided with a sliding member 23 between the locking member 22 and the hand push rod 14 that can drive the locking member 22 to disengage from the locking position 21 when being pulled. The lever 14 is also provided with an operating member 24 that can make the sliding member 23 slide relative to the hand push rod 14 when it is operated. There is a first elastic member 26 between the locking member 22 and the hand push rod 14, which can keep the locking member 22 in a locked state. The sliding member 23 is connected to the hand push rod 14. A first return spring 27 is provided between the rods 14 . The sliding member 23 and the locking member 22 are provided with inclined sliding surfaces that cooperate with each other to press against each other. When the first locking device 2 needs to be unlocked, the operating member 24 is operated. When the operating member 24 is operated, the transmission member 25 is pulled. The transmission member 25 pulls the sliding member 23 to slide vertically relative to the hand push rod 14. When the sliding member 23 slides vertically, it drives the The locking member 22 slides laterally relative to the hand push rod 14 , and is gradually disengaged from the locking position 21 on the front leg 11 during the sliding process of the locking member 22 . At this time, the hand push rod 14 can slide downward relative to the front leg 11 . And was folded into the front leg 11. When it is necessary to lock the hand push rod 14 and the front leg 11 again, pull the hand push rod 14 upward until the latch 22 on the hand push rod 14 is aligned with the locking position 21 again, and the first return spring 27 pushes the latch 22 After being snapped into the locking position 21 , the first elastic member 26 presses the sliding member 23 to reset, and at this time, the push rod 14 and the front leg 11 are locked again. The transmission member 25 is a pull rope, a pull cable and the like.

As shown in FIG. 17 , the lower end of the front leg 11 is further provided with a positioning portion 111 for the locking member 22 to be locked and positioned, and when the locking member 22 is locked into the positioning portion 111 , the The second locking device 3 is still in the locked state. When the locking member 2 is snapped into the positioning portion 111, the push rod 14 is locked in the folded position, the push rod 14 will not slide relative to the front leg 11, but the second locking device 3 is still in the locked state , the rear legs 12 and the front legs 11 are still open, and when the seat assembly 4 faces the hand push rod 14, the stroller can also be used as a children's dining chair, and the applicable range is wider. The front leg 11 is provided with a leg rest 114 that can be unfolded or folded. The leg rest 114 can be used for children to rest their legs when the leg rest 114 is unfolded. children can rest their feet. When the entire frame needs to be folded, the operating member 24 is operated to disengage the locking member 22 from the positioning portion 111, and the hand push rod 14 is pushed downward, at this time, the second locking device 3 is driven to unlock, and then the front leg is lifted upward. At the upper end of 11, the rear leg 12 can be folded close to the front leg 11 under its own weight.

As shown in FIGS. 7 to 8 , the hand push rod 14 is further provided with a secondary locking assembly 8 capable of preventing the unlocking of the first locking device 2 . The secondary locking assembly 8 can prevent the first locking device 2 from being unlocked by mistake, so that the entire stroller can be folded, which is safer.

As shown in FIG. 8 , the secondary locking assembly 8 includes an unlocking member 81 rotatably connected to the hand push rod 14 and located above the sliding member 23 to prevent the sliding member 23 from sliding relative to the hand pushing rod 14 . 81 is connected with an operating portion 811 that can operate the unlocking member 81 to rotate so that the unlocking member 81 makes way for the sliding member 23. There is also an operating portion 811 between the unlocking member 81 and the hand push rod 14 that can keep the unlocking member 81 in the blocking position. The second elastic member 82 in the sliding position of the sliding member 23 . When the first locking device 2 needs to be unlocked, the second locking assembly 8 should be unlocked first, and the operation part 811 should be operated. When the operation part 811 is operated, the unlocking member 81 will be rotated relative to the hand push rod 14, and the unlocking member 81 will leave when it is rotated. After the sliding path of the sliding member 23 is changed and the position of the sliding member 23 is made, the sliding member 23 can have a sufficient stroke to pull the sliding member 23 up. When the operating portion 811 is not stressed, the second elastic member 82 pushes the unlocking member 81 back to its original position.

As shown in FIGS. 10 to 11 , the second locking device 3 includes a first hinged shell 31 provided on the front leg 11 and a second hinged shell 32 provided on the rear leg 12 . The first hinged shell 31 and the second hinge shell 32 are surrounded by a cavity 33, the first hinge shell 31 and the second hinge shell 32 are connected with spline grooves 34, and the cavity 33 is slidably connected with splines 35. The first hinge shell 31 is rotatably connected with a top pressing member 36 that can push the splines 35 to slide laterally and disengage from the spline grooves 34 on the first hinge shell 31. The top pressing member 36 is located on the The eccentric position of the top pressing member 36 is also connected with a driving rod 37 that is pushed by the hand push rod 14 and drives the top pressing member 36 to rotate when the hand push rod 14 slides relative to the front leg 11. The hand push rod 14 is provided with a When it slides relative to the front leg 11, it can push the driving position 38 of the driving rod 37 to move downward. A second return spring 39 is provided between the driving rod 37 and the pressing member 36. A third elastic member 30 is provided between the two hinge shells 32 to enable the splines 35 to engage with the spline grooves 34 on the first hinge shell 31 and the second hinge shell 32 at the same time. When the first locking device 2 is unlocked, push the hand push rod 14 to slide down along the front leg 11 until the driving position 38 on the hand push rod 14 gradually abuts against the driving rod 37, and the driving rod 37 is pushed back The top pressing member 36 can be driven to rotate relative to the front leg 11. When the top pressing member 36 rotates, it pushes the splines 35 to slide laterally relative to the first hinge shell 31 and the second hinge shell 32, and the splines 35 are completely pushed when pushed. After leaving the first hinged shell 31 and entering the second hinged shell 32, the rear leg 12 can rotate and move closer to the front leg 11. When the user lifts the hand push rod 14 and the front leg 11, the rear leg 12 is under its own weight. Under the action, the front leg 11 is moved closer and folded.

As shown in FIGS. 10 to 12 , the splines 35 are provided with protrusions 351 that protrude outward, the protrusions 351 are provided with a first inclined sliding surface 3511 , and the pressing member 36 is provided with a first inclined sliding surface 3511 . An accommodating groove 361 capable of accommodating the protrusion 351 is provided, and the pressing member 36 is provided with a second inclined sliding surface 3611 which can press against the first inclined sliding surface 3511 to drive the spline 35 to move laterally. When the second locking device 3 is in the locked state, the protrusion 351 on the spline 35 is located in the accommodating groove 361 . When the pressing member 36 rotates, the second inclined sliding surface 3611 on the pressing member 36 pushes the first inclined sliding surface 3511 on the protrusion 351 and pushes the spline 35 to laterally slide.

As shown in FIG. 7 and FIG. 13 , the third locking device 6 includes a sliding member 61 slidably connected to the connecting base 5 , and the bottom support frame 1 is provided with a sliding member 61 that can abut against the connection to prevent the connection. The stop position 62 for the base 5 to rotate relative to the bottom support frame 1, the connecting base 5 is provided with an operating button 63 that can make the sliding member 61 slide relative to the connecting base 5 and disengage the stop position 62 during operation. A pull cable 64 is provided between the operating button 63 and the sliding member 61 , and a fourth elastic element 65 is provided between the sliding member 61 and the connecting seat 5 to keep the sliding member 61 and the stop 62 in abutting state. When unlocking the third locking device 6, first unlock the secondary locking device 7, and then operate the operation button 63, the operation button 63 will pull the cable 64 to move upward, and the cable 64 will pull the sliding member 61 to move upward relative to the connecting base 5 , the sliding member 61 is separated from the stop position 62 of the bottom support frame 1 when it moves upward relative to the connecting base 5 , at this time, the connecting base 5 can rotate relative to the bottom support frame 1 to move closer to the front legs 11 and fold.

As shown in FIG. 7 and FIG. 14 , the secondary locking device 7 includes a rotating rod 71 rotatably connected to the bottom support frame 1 . When the bottom support frame 1 slides, it is pressed by the push rod 14 to make the top pressing part 711 of the rotating rod 71 to rotate. The rotational movement of the seat 5 gives way to the unlocking position of the position. When the rotating rod 71 is driven by the hand push rod 14 to rotate relative to the bottom support frame 1, the rotating rod 71 moves to the unlocking position so as to allow the rotation of the connecting seat 5 to move. When the rotating rod 71 is disengaged from the push rod 14, the self-weight of the rotating rod 71 causes the rotating rod 71 to move from the unlocking position to the blocking position.

When the hand push rod 14 slides relative to the front leg 11, the outer wall of the hand push rod 14 pushes the top pressing portion 711 to make the rotating rod 71 rotate relative to the bottom support frame 1, and the rotating rod 71 moves from the blocking position to the unlocking position. At this time, the rotating rod 71 can make way for the connecting seat 5, and the pressing part 711 on the rotating rod 71 and the push rod 14 are always in abutting state. And when the hand push rod 14 is pulled up and unfolded, the outer wall of the hand push rod 14 is separated from the top pressing part 711 , and the rotating rod 71 is moved from the unlocking position to the blocking position due to the self-weight of the rotating rod 71 . The rod 71 stays on the rotating path of the connecting base 5, and again plays the role of a secondary lock.

As shown in FIGS. 1 to 2 , the front leg 11 is also rotatably connected with a leg rest member 112 that can be unfolded or folded. When the leg rest member 112 is unfolded, the child can rest the leg, so that the child can ride more comfortably.

As shown in FIG. 17 , the front leg 11 is provided with a first protruding portion 113 , and the rear leg 12 is provided with a first protruding portion 113 that can interact with the first protruding portion 113 when the rear leg 12 is unfolded relative to the front leg 11 . The second protruding portion 121 is pressed against and prevents the rear leg 12 from continuing to rotate. The first protrusion 113 and the second protrusion 121 cooperate to define a deployed position between the front leg 11 and the rear leg 12 .

Claims (10)

1. A child stroller frame, characterized in that it comprises a bottom support frame (1) that can be folded, and the bottom support frame (1) comprises a front leg (11) and is rotatably connected around a first axis (A). The rear leg (12) on the front leg (11), the front leg (11) and the rear leg (12) are connected with a wheel assembly (13), and the front leg (11) is also connected with a wheel assembly (13). A hand push rod (14) capable of being unfolded or folded by sliding relative thereto, and between the hand push rod (14) and the bottom support frame (1), the hand push rod (14) can be locked in the unfolded state The first locking device (2) is provided between the front leg (11) and the rear leg (12), which can lock the two and when the hand push rod (14) slides relative to the bottom support frame (1) A second locking device (3) that can be unlocked by linkage with the push rod (14). 2 . The stroller frame according to claim 1 , wherein the front legs ( 11 ) are also rotatably connected around the second axis (B) and are connected to the seat assembly ( 4 ) and can be connected to the seat assembly ( 4 ). 3 . The front leg (11) has a rotating and folded connecting seat (5), and a third locking device capable of locking the connecting seat (5) in the unfolded position is further provided between the connecting seat (5) and the bottom support frame (1). (6). 3. The child stroller frame according to claim 2, characterized in that: the front legs (11) are further provided with a device that can prevent the connecting seat (5) from rotating relative to the bottom support frame (1) and push it by hand. When the rod (14) slides relative to the front leg (11), the secondary locking device (7) can be linked and unlocked by the hand push rod (14). 4. The stroller frame according to claim 1, characterized in that: the first locking device (2) comprises a locking position (21) provided on the front leg (11), and the hand push The lever (14) is provided with a locking member (22) that can slide relative to the hand push rod (14) to be locked into or disengaged from the locking position (21), the locking member (22) and the hand push rod (14) There is a sliding member (23) between which can drive the locking member (22) to disengage from the locking position (21) when being pulled, and the hand push rod (14) is also provided with a sliding member (23) which can make the sliding when being operated There is an operating member (24) in which the member (23) slides relative to the hand push rod (14). The operating member (24) and the sliding member (23) are provided with a sliding member that can drive the sliding member when the operating member (24) is operated. (23) A sliding transmission member (25), a first elastic member (26) is arranged between the locking member (22) and the hand push rod (14) to keep the locking member (22) in a locked state ), a first return spring (27) is arranged between the sliding member (23) and the push rod (14). 5 . The stroller frame according to claim 4 , wherein the lower end of the front leg ( 11 ) is further provided with a positioning portion ( 111 ) capable of engaging and positioning the locking member ( 22 ). 6 . And when the locking member (22) is locked into the positioning portion (111), the second locking device (3) is still in a locked state. 6. The stroller frame according to claim 4, characterized in that: the hand push rod (14) is further provided with a second locking assembly (8) capable of preventing the unlocking of the first locking device (2). The second locking assembly (8) includes an unlocking member (81) that is rotatably connected to the hand push rod (14) and is located above the operating member (24) to prevent the operating member (24) from sliding relative to the hand push rod (14). ), the unlocking member (81) is connected with an operating portion (811) capable of operating the unlocking member (81) to rotate so that the unlocking member (81) makes way for the operating member (24), and the unlocking member (81) ) and the push rod (14) are also provided with a second elastic member (82) which can keep the unlocking member (81) in a position preventing the sliding of the operating member (24). 7. The stroller frame according to claim 1, wherein the second locking device (3) comprises a first hinged shell (31) provided on the front leg (11) and a first hinged shell (31) provided on the rear A second hinged shell (32) on the leg (12), a cavity (33) is enclosed between the first hinged shell (31) and the second hinged shell (32), the first hinged shell (32) (31) and the second hinge shell (32) are both connected with spline grooves (34), the cavity (33) is slidably connected with a spline (35), and the first hinge shell (31) A top pressing member (36) that can push the spline (35) to slide laterally and disengage from the spline groove (34) on the first hinge shell (31) is rotatably connected, and the top pressing member (36) is located on the top The eccentric position of the pressing member (36) is also connected with a driving rod (37) which is pushed by the hand push rod (14) and drives the top pressing member (36) to rotate when the hand push rod (14) slides relative to the front leg (11), The hand push rod (14) is provided with a driving position (38) that can push the driving rod (37) downward when it slides relative to the front leg (11). A second return spring (39) is provided between the pressing members (36), and a spline (35) and the first hinge shell (32) are provided between the splines (35) and the second hinge shell (32). 31) A third elastic member (30) that is simultaneously engaged with the spline groove (34) on the second hinge shell (32). 8. The stroller frame according to claim 3, characterized in that: the third locking device (6) comprises a sliding member (61) slidably connected to the connecting seat (5), and the bottom The support frame (1) is provided with a stop position (62) capable of abutting against the sliding member (61) to prevent the connection seat (5) from rotating relative to the bottom support frame (1). There is an operation button (63) that can make the sliding member (61) slide relative to the connecting seat (5) and disengage the stop position (62) during operation, and a space between the operation button (63) and the sliding member (61) is provided. There is a pull cable (64), and a fourth elastic element (65) is provided between the sliding member (61) and the connecting seat (5), which can keep the sliding member (61) and the stop position (62) in abutting state ). 9 . The child stroller frame according to claim 8 , wherein the secondary locking device ( 7 ) comprises a rotating rod ( 71 ) rotatably connected to the bottom support frame ( 1 ). The rotating rod (71) is provided with a pushing portion that extends outward and is pushed by the hand push rod (14) when the hand push rod (14) slides relative to the bottom support frame (1) to make the rotating rod (71) rotate (711), the position where the rotating lever (71) stays includes a blocking position that can prevent the connecting seat (5) from rotating and an unlocking position that can make way for the rotating movement of the connecting seat (5). 71) When driven by the hand push rod (14) to rotate relative to the bottom support frame (1), the rotating rod (71) moves to the unlocked position to make way for the rotating movement of the connecting seat (5). (71) When disengaging from the hand push rod (14), the self-weight of the rotating rod (71) makes the rotating rod (71) move from the unlocking position to the blocking position. 10. The child stroller frame according to claim 1, wherein the front legs (11) are also rotatably connected with leg rest parts (112) that can be unfolded or folded.

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